Key parameters at a glance
- A radius of 16.06 Earth radii
- A mass of 434.15 Earth masses
- Surface gravity around 1.68 g
- An orbital period of 2.181 days
- Semi-major axis 0.0355 AU
- Equilibrium temperature 1,759 K (1486 °C)
- Distance from Earth 1,027.38 light-years
- Earth Similarity Index 0.066
- Travel time at Voyager 1 speed 18,117,759 years
K2-237 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#156of 1771
top 8.8%
This planet
16.06R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | K2-237 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 16.06 | 11.21 |
| Mass (M⊕) | 1.00 | 434.15 | 317.83 |
| Density (g/cm³) | 5.51 | 0.58 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.68 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,860.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 434.154 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 16288184
Gaia DR2
Gaia DR2 6032746832450438400
Gaia DR3
Gaia DR3 6032746832450438400
System
K2-237
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.18 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0355 AU.
Transit Fingerprint
Depth
1.416 %
Duration
2.927 h
Impact parameter b
0.171
Rp / R★
0.119000
Transit midpoint (BJD)
2,457,706.6162
Photometric dip
Transit produces a flux drop of 14,160 ppm lasting ≈ 2.93 h.
Extended Orbital Architecture
Planet / star radius ratio
0.119000
Semi-major axis / stellar radius
6.180
Impact parameter (b)
0.171
RV semi-amplitude (K)
184.000 m/s
Transit mid-time (BJD)
2,457,706.6162
Long. of periastron (ω)
73.00°
Angular separation (arcsec)
0.11300
Eq. Temperature
1,759K
(1486 °C)
Insolation (S⊕)
1,860.00
Earth = 1.00
Earth Similarity (ESI)
0.066
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Soto et al. 2018Instrument
Kepler CCD Array
Publication
2018-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-237
Spectral Class
F-type yellow-white
Effective Temperature
6,180 K — hotter than the Sun (5,778 K)
Estimated Age
1.09 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.236 R☉
Stellar Mass
1.256 M☉
Metallicity [Fe/H]
0.34
Extended Stellar Properties
Surface gravity (log g)
4.353 dex
Stellar density
0.937 g/cm³
Systemic radial velocity
-22.47 km/s
Rotational v·sin i
11.76 km/s
Rotation period
5.07 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
3.149 mas
Total Proper Motion
10.215 mas/yr
PM Right Ascension
-8.57 mas/yr
PM Declination
-5.56 mas/yr
Galactic Cartesian (pc)
x = -0.245 · y = -0.842 · z = -0.480
Equatorial (J2000)
RA 253.76885° · Dec -28.71058°
Galactic ℓ, b
353.871° · 9.234°
Ecliptic λ, β
255.724° · -6.072°
HTM-20 index
1073298405
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